Journal of Yeungnam Medical Science

Myung Se Kim

28 Articles

Role of Radiation Therapy in Treatment of Stomach Cancers: Sang Mo Yun, Myung Se Kim; Yeungnam Univ J Med. 2007;24(2 Suppl):S245-251. Published online December 31, 2007; DOI: https://doi.org/10.12701/yujm.2007.24.2S.S245

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Abstract PDF: Although occasionally used as a therapeutic modality, radiotherapy was not a routine part of the treatment of stomach cancer. As a single modality, preoperative radiotherapy showed some benefit, but this was not confirmed in radomized trial. In recent neoadjuvant trials, radiotherapy is usually given concurrently with chemotherapy, and pathologic complete response rates was about 30%. There were small studies of radiotherapy as an adjuvant, either alone or with chemotherapy, but the randomized studies using postoperative radiotherapy alone did not show a survival benefit. The results of intergroup gastric adjuvant trial(INT 0116) were presented in May 2000 at American Society of Clinical Oncology. In that report, postoperative concurrent chemoradiotherapy showed survival benefit. INT 0116 has established postoperative chemoradiotherapy as the standard care for high risk patients with resected stomach cancer. But, INT 0116 had several weak points including lack of standardized nodal dissection and delivery rates of treatments. So, Asian and European investigators did not agree. Korean study showed benefit of postoperative chemoradiotherapy after D2 dissection, but this study was not randomized. Recently, Korean investigators started randomized trial of chemoradiotherapy in D2 dissected patients. This trial may give answer to us about the benefit of postoperative chemoradiotherapy in resected stomach cancer.

Dose distribution of Intensity Modulated Radiation Therapy and 3 Dimensional Conformal Radiation Therapy in Prostate Cancer: Sung Kyu Kim, Myung Se Kim, Sang Mo Yun; Yeungnam Univ J Med. 2007;24(2 Suppl):S538-543. Published online December 31, 2007; DOI: https://doi.org/10.12701/yujm.2007.24.2S.S538

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Purpose：The aim of this study was to compare the dose distribution of intensity modulated radiation therapy (IMRT) with 3 dimensional conformal radiation therapy (3DCRT) in prostate cancer. Materials and Methods：The IMRT plan and the 3DCRT plan used the 9 fields technique, respectively. In IMRT, tumor dose was a total dose of 50 Gy at 2.0 Gy per day, 5 days a week for 5 weeks. All cases were following the dose volume histogram (DVH) constraints. The maximum and minimum tumor dose constraints were 5,075 cGy and 4,925 cGy, respectively. The rectum dose constraints were <35% over 40 Gy. The bladder dose constraints were <35% over 30 Gy. The femur head dose constraints were <15% over 16 Gy. Tumor dose in the 3DCRT were 50 Gy.
Results
：In IMRT, the maximum dose of PTV was 101.9% and minimum dose was 89.5% for given dose. In 3DCRT, the maximum dose of PTV was 103.5% and minimum dose was 86.5% for given dose. The rectum dose was 29.2% over 40 Gy in IMRT compared with 67.9% in 3DCRT. The bladder dose was 30.1% over 30 Gy in IMRT compared with 30.6% in 3DCRT. The right femur head dose was 5.3% over 16 Gy in IMRT compared with 8.3% in 3DCRT. The left femur head dose was 6.8% over 16 Gy in IMRT compared with 9.1% in 3 DCRT.
Conclusion
：The dose of critical organs (rectum, bladder, and femur head) in IMRT showed to reduce than dose of 3DCRT. The rectum dose over 40 Gy in IMRT was reduced 38.7% than 3DCRT. The bladder dose over 30 Gy in IMRT was similar to 3DCRT. The femur head dose over 16 Gy in IMRT was reduced about 2.3∼3% than 3DCRT.

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Changes in Volume Dose by Treatment Plan According to pCT and CBCT in Image-guided Radiation Therapy for Prostate Cancer
Young Jin Won, Jung Hoon Kim
Journal of Radiological Science and Technology.2018; 41(3): 209. CrossRef
A Comparison between Three Dimensional Radiation Therapy and Intensity Modulated Tadiation Yherapy on Prostate Cancer
YoungJae Kim, JaeSub Lee, Seongill Hong, HyeJin Ko
Journal of the Korean Society of Radiology.2013; 7(6): 409. CrossRef

Development of Multichannel On-line Thermometry System.: Sei One Shin, Hyun Jin Shin, Myung Se Kim, Sung Kyu Kim; Yeungnam Univ J Med. 1999;16(2):193-199. Published online December 31, 1999; DOI: https://doi.org/10.12701/yujm.1999.16.2.193

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Abstract PDF: BACKGROUND
Measurement of body temperature is an important parameter inpatient management in many clinical condition. Failure to reach minimal acceptable and has necessitated the application of additional therapy. The authors developed a new, simple, accurate thermometry system, which could be used to undertake precise temperature measurement for various clinical conditions. MATERIALS AND METHODS: A new thermometry system using a specially designed temperature detecting and display system was developed. This system contains a temperature detecting sensor(LM 35CZ), which enables multiple serual checking of heat, data collection and processing computer, and 3-dimensional display system. It provides realtime volumetric visualization of temperature of a defined volume and stores and prints the data. RESULTS: With this system, temperature can be measured at multiple interesting sites simultaneously , demonstrated as a 3-dimensional temperature distribution and stored. In well-controlled, systematic experiments a significant correlation has been observed between standard temperature using this system at carious measuring points. CONCLUSION: This thermonetry system is a real-time measurement system, which can demonstrate 3-dimensional heat distribution in experimental phantom and human body and can be used for diagnosing abnormal conditions. In addition, this system reduces the nursing staff work load, providing them more time for long term care to patients.

Sequential Combination Chemotherapy and Radiotherapy of an Isolated Non-Hodgkin's Lymphoma of the Larynx: Report of A Case.: Sei One Shin, Myung Se Kim, Sung Kyu Kim, Young Ran Shim; Yeungnam Univ J Med. 1997;14(2):443-450. Published online December 31, 1997; DOI: https://doi.org/10.12701/yujm.1997.14.2.443

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Abstract PDF

No abstract available.

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Individual participant data meta-analysis of primary laryngeal lymphoma: Focusing on the clinical characteristics and prognosis
Kyung Hee Kim, Rock Bum Kim, Seung Hoon Woo
The Laryngoscope.2015; 125(12): 2741. CrossRef

Therapeutic Results of Radiotherapy in Nonsmall Cell Lung Cancers.: Sei One Shin, Sung Kyu Kim, Myung Se Kim; Yeungnam Univ J Med. 1994;11(1):72-81. Published online June 30, 1994; DOI: https://doi.org/10.12701/yujm.1994.11.1.72

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Abstract PDF: Total 55 patients with nonsmall cell lung cancer treated with radiation therapy at Department of Therapeutic Radiology, Yeungnam University Hospital, between May-1 1986 and April-30 1993 were retrospectively analyzed by clinical characteristics, failure patterns follow up duration and survival ratio according to prognostic factors. Obtained results were as follows : 1. Male to female ratio was 17.3 2. Sixth and seventh decades were predominant age group. 3. The patients were 8 in stage I-II, 34 in stage IIIA, 13 in stage IIIb, respectively. 4. Forty five patients out of 55 were squamous cell carcinoma. 5. Primary tumor were originated from upper lobe bronchi predominantly. 6. The size of the primary tumor, lymph node involvement and the degree of differentiation were important in evaluation of prognosis. 7. In conclusion, for patients with poor prognostic factors systemic chemotherapy and multidisciplinary approach were recommended for better treatment outcome and improvement of survival.

Conservative surgery and definitive radiotherapy in early breast cancer: Sei One Shin, Jung Sook Hong, Myung Se Kim, Young Do Lee, Sung Kyu Kim, Soo Jung Lee; Yeungnam Univ J Med. 1993;10(2):380-387. Published online December 31, 1993; DOI: https://doi.org/10.12701/yujm.1993.10.2.380

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Abstract PDF: Local excision and axillary dissection followed by radiation therapy to the breast has been shown to achieve equivalent local control and survival as mastectomy in an prospective randomized trials. We analyzed 28 cases of early breast cancer in order to evaluate the therapeutic effects of conservative f surgery and definitive radiotherapy in the management of early breast cancer as possible alternative of simple mastectomy, retrospectively. Obtained results were as follows 1. Treatment related acute side reactions are more prominant in the case of chemoradiotherapy group than radiotherapy alone group. 2. There were no cases of primary, regional or systemic failures on the last follow up examination. 3. Cosmetic results after treatment were satisfactory in 26 cases out of 28 cases on the last follow up examination. 4. There were no demonstrable differences of tumor control and cosmetic results between the treatment groups. Although, these results suggested that definitive radiotherapy after local excision would be a possible and desirable alternative instead of total mastectomy in the management of early breast cancers, analyzed cases were too small and follow up period was too short to evaluate the therapeutic effect of primary radiotherapy after local excision, exactly.

Radition effect on colony formation of hela.S3(SC) cell line.: Sei One Shin, Sung Kyu Kim, Myung Se Kim; Yeungnam Univ J Med. 1993;10(1):212-217. Published online June 30, 1993; DOI: https://doi.org/10.12701/yujm.1993.10.1.212

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Abstract PDF: Since discovery of X-rays, radiotherapy has evolved into one of the most scientific branches of medicine and has established its role as the primary line or the secondary line of attack, after surgery,. in the treatment of malignant cancers. Nowadays its importance is illustrated by the fact that as many as 70 per cent of all pastients with cancer will receive radiation therapy at sometime during their disease process. Biologic effects-of X-rays began to be apparant soon after the discovery by Roentgen in 1895. In clinical radiotherapy, the biologic endpoint of most importance is loss of cellular reproductive ability or clonogenicity. One of the commonest ;nays to assess cell survival is to use an in vitro plating assay. We analyzed radiation effect on colony formation of HaLa. S3(SC) cell line and obtained results are as follows The plating efficiency is 0.464. The shape of cell survival curve is similar to multi-target plus single hit component model. Estimated values of Do, Dq, and extrapolation number are 150 cGy, 80 cGy and 1.7 respectively. We reported these experimental data with review of literature.

Radiation therapy of nasopharyngeal cancers.: Sei One Shin, Sung Kyu Kim, Myung Se Kim; Yeungnam Univ J Med. 1992;9(2):312-320. Published online December 31, 1992; DOI: https://doi.org/10.12701/yujm.1992.9.2.312

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Abstract PDF: Radiotherapeutically, nasopharyngeal caner is an important disease in Korea. Because of its blind anatomic location, early detection is relatively uncommon. Clinically, most of cases are locally advanced and nodal involvements are common. Recently better understanding of nature of the disease and improvement of radio – therapy technique permit better treatment result, including locoregional control and survival rate, and minimal normal tissue damages comparing with previously published date. We analyzed 31 patients of pathologically proven and previously untreated naso – pharyngeal carcinoma with different treatment techniques, retrospectively. Minimal and maximal follow up period of the survivor is 6 months and 68 months, respectively. Thirteen patients with squamous cell carcinoma are included in this analysis. The median age is 49 years (range from 20 to 64 years). Twenty two patients are stage III. Eleven patients are treated with radiotherapy alone and 20 are treated with combined modalities treatment. The degree of response after radiotherapy are categorized by 3-classes, i,e. complete response, partial response. In spite of similarities of complete response rate and 1-year survival rate between two different treatment techniques, those patients with undifferentiated carcinoma appear to benefit from the adjuvant chemotherapy. In addition, systemic failure is more suggest that adjuvant therapy in the radiotherapeutic management of nasopharyngeal cancer needs additional research according to histologic types and future extensive clinical trials.

Palliative effect of radiation therapy in management of symptomatic osseous metastases: Sei One Shin, Sung Kyu Kim, Myung Se Kim; Yeungnam Univ J Med. 1992;9(1):102-109. Published online June 30, 1992; DOI: https://doi.org/10.12701/yujm.1992.9.1.102

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Abstract PDF: Bone metastases represent an important and frequent clinical problem in patients with advanced cancers. Especially, painful bone metastases are common features in these patients. Radiotherapy is an effective tool for palliative aim of painful metastatic osseous lesions. Various treatment results have been previously reported. The present retrospective study was aimed to evaluate the efficacy of palliative irradiation on pain relief, with the goal of selecting appropriate irradiation dose schedule. Radiotherapy consisted of 5 times a week with a various fractional dose between 180 and 400cGy. The response of pain relief and the survival time after completion of radiotherapy are related to total dose and most of the patients have shown a similar response by the end of radiotherapy. The higher dose and the more aggressive multimodality treatment, the better pain control and the longer survival time.

A study on dose distribution of small irradiation field in the electron therapy.: Sung Kyu Kim, Sei One Shin, Myung Se Kim; Yeungnam Univ J Med. 1991;8(2):114-120. Published online December 31, 1991; DOI: https://doi.org/10.12701/yujm.1991.8.2.114

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Abstract PDF: In electron therapy, low melting point alloy is used for shaping of the field. Electron field shaping material affect the output factor as well as the collimator system. The output factors of electron beams for shaped fields from NELAC-1018 were measured using ionization chamber of Farmer type in water phantom. The output factors of electron beams depend on the incident energy, inherent collimator system and the size of shaped field. Obtained results were followings. 1. In the smaller applicator, output varied extremely according to extent of collimator opening. 2. The higher energy, the output is less varied according to treatment field at small field.

A study of dose distribution in postoperative radiotherapy in uterine cervical cancer.: Sei One Shin, Sung Kyu Kim, Myung Se Kim; Yeungnam Univ J Med. 1991;8(1):166-177. Published online June 30, 1991; DOI: https://doi.org/10.12701/yujm.1991.8.1.166

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Abstract PDF: Uterine cervical cancer is the most common malignancy in Korean women. In spite of recent development of early diagnostic and therapeutic modalities, about 40% of treated patient will develop relapse. So more aggressive local treatment such as more extensive surgery and higher radiation dose and administration of systemic chemotherapy will promote the curability but treatment related complications cannot be avoidable. We used 22 cases of early cervical cancer, treated with surgery and post-operative radiotherapy, clinical data of these patients were analyzed to determine relationship between clinical parameters and final outcome. Three out of 22 cases revealed relapse and one patient showed rectovaginal fistula and another patient showed small bowel obstruction and the other patient showed rectal obstruction. Two out of three recurrence were stage IIa and the other one case was stage Ib adenocarcinoma with lymphovascular involvement. Nineteen out of 22 cases were followed without remarkable side effect or treatment related complication or sequelae. We concluded that out treatment policy was safe and effective to eradicate high risk postoperative cervical cancer with acceptable side effects or complication.

The Clinical Review of Superior Vena Cava Syndrome.: Joung Sun Kang, Sam Beom Lee, Choong Ki Lee, Jin Hong Chung, Hyoung Woo Lee, Kwan Ho Lee, Myung Soo Hyun, Hyun Woo Lee, Sei One Shin, Myung Se Kim; Yeungnam Univ J Med. 1990;7(2):151-158. Published online December 31, 1990; DOI: https://doi.org/10.12701/yujm.1990.7.2.151

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Abstract PDF: We reviewed 30 cases of superior vena cava syndrome in adult patients who were seen at the Yeungnam University Hospital from January 1985 to June 1990. The results were as follows: 1. The male-to-female ratio was 6.5:1, and the most patients were in the age group between the sixth and seventh decades. 2. The most common symptoms were dyspnea (87%) and followed by cough (63%), facial swelling (63%) and chest pain (44%) and the physical signs were dilated neck vein (97%), facial edema (93%) and facial flushing (45%) in order of frequency. 3. The simple chest x-ray findings were superior mediastinal widening (90%), right hilar mass (77%) and pleural effusion (31%). 4. Diagnosis was made by history and physical examination (100%), chest C-T scan (100%), simple chest x-ray (97%), bronchoscopy with biopsy (40%) and so on. 5. 21 cases of patients were confirmed by histology: 14 cases (46%) of bronchogenic ca, 4 cases (14%) of lymphoma, 3 cases (10%) of metastatic lung ca. Of bronchogenic ca, small cell ca was 7 cases (23%), squamous cell ca, 5 cases (17%), and unclassified cawas 2 cases (6%). 6. In response of treatment, the clinical improvement was achieved in 18 cases with radiotherapy alone, 1 case with chemotherapy only, and 6 cases with radio-chemotherapy.

A Study on the dosimetry in boundary of shielding block in high energy irradiation.: Myung Se Kim, Sung Kyu Kim, Sei One Shin; Yeungnam Univ J Med. 1990;7(2):115-120. Published online December 31, 1990; DOI: https://doi.org/10.12701/yujm.1990.7.2.115

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Abstract PDF: Scatter-air ratios are used for the purpose of calculating scattered dose in the medium. The computation of the primary and the scattered dose separately is particularly useful in the dosimetry of irregular fields with shielding block in radiation field, dose distribution of scattered radiation using 18MeV Linear accelerator and Co-60 teletherapy measured. The effect of scattered radiation dose by protecting block was been ignored in radiation therapy, 2-3% of scattered radiation may be 90-200cGy which could be influence vital complication such as cataract, oligospermia or sterility. So that exact calculate scattered radiation by protecting block exactly for irregular field c small protection of vital organ is very important. The purpose of this article is to calculate scattered radiation by protecting block exactly for irregular field c Linac or Co-60 irradiation and to applicate these data in clinical radiation field. Authors could obtain following results. 1. The lesser angle between shielding block showed more scattered radiation. 2. With decreasing distance between shielding blocks, the dependent of scattered radiation were increased. 3. Output of 18 MeV Linear accelerator and Co-60 was related linear proportion on field size, but independent according to the size of shielding block in 18 MeV Linear accelerator.

Radiation Therapy of Head and Neck Cancer with CO-6O HDR Transcatheteric Irradiation.: Sei One Shin, Sung Kyu Kim, Myung Se Kim; Yeungnam Univ J Med. 1990;7(2):109-114. Published online December 31, 1990; DOI: https://doi.org/10.12701/yujm.1990.7.2.109

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Abstract PDF: The basic strategy of irradiation is to deliver a dose to the cancer that is high enough to make cancer cells incapable of reproduction, while keeping the doses to the various healthy tissues below tolerable levels. In order to improve local control and survival, as a boost therapy after external radiotherapy, high dose rate transcatheteric irradiation using remote control after loading system (RALSTRON-20B) was used for twelve patients with head and neck cancers. Present results showed complete remission of cancer in 9 out of 112 patients without treatment related complications. Although this procedure is easy to operate, well trained skillful hand in essential for good results. Furthermore out experience suggested that meticulous treatment planning should be developed for better results.

A study on the attitude toward dying and hospice.: Young Uck Kim, Jung Hoon Lee, Jong Bum Lee, Byung Tak Park, Seung Duk Cheung, Myung Se Kim, Hoo Ja Kim; Yeungnam Univ J Med. 1990;7(2):55-66. Published online December 31, 1990; DOI: https://doi.org/10.12701/yujm.1990.7.2.55

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Abstract PDF

This research is focused on the attitudes toward dying and hospice. 4subjects groups are Ca. patient, Ca. patient's family, elderly, medical personnel. A 40 questionnaire was filled out by each participant. For this study chi-square and T-test was done. The results were as follows: 1. Telling the truth 61.2% of all subject groups agreed upon telling the impending death. About 40% of elderly group and cancer patient group were disagreed which is the highest percentage in all groups. Particularly medical personnel group were remarkably high in telling the truth. 2. Attitudes of medical personnels 43.3% of all groups agreed upon medical personnels prefer to avoid dying patient. In medical personnel group. 44% of respondents disagreed comparably higher than other group, But 37.3% of medical personnel agreed. It showed that medical personnels admitted their negative feelings toward dying patient in considerable degree. 3. Attitudes toward mechanical assistance for life-expanding or hopeless patient. 44.8% of all groups disagreed upon mechanical assistance for hopeless case. Elderly (54.9%) and medical personnels (50%) disagreed, which is higher than cancer patient (33.3%) and (22.8%) of cancer patient's family. 4. Special facility and educational preparation for dying patient. 67.4% of all groups agreed upon the needs of special facility for dying, 81.3% of medical personnels agreed which is highest percentage in all group. 5. Attitudes of family members of dying patient. 82.3% of all groups agreed upon the family members feel annoyed at dying patient. 34% of cancer patient's family member and 48% of cancer patients group agreed, but elderly group showed highest percentage (84%). 6. Perception of dying patient about imminent death. 58.3% of all group thought dying patients are aware of their impending death even though they had not been told. 77.3% of medical personnel agreed which is highest percentage in all group.

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Effects of Death Preparation Education on Awareness of Hospice Palliative Care and Withdrawing Life Sustaining Treatment in City Dwellers
Pei-Ling Tsung, Yoon Joo Lee, Su Yeon Kim, Seul Ki Kim, Si Ae Kim, Hyeon Ji Kim, Yi Nam, Suk Young Ham, Kyung Ah Kang
The Korean Journal of Hospice and Palliative Care.2015; 18(3): 227. CrossRef

Two Cases of Nasopharyngeal Carcinoma Treated with Co-60 HDR ICR.: Sei One Shin, Cheol Hoon Kang, Seong Gyu Kim, Myung Se Kim; Yeungnam Univ J Med. 1990;7(1):197-201. Published online June 30, 1990; DOI: https://doi.org/10.12701/yujm.1990.7.1.197

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Abstract PDF: The primary treatment modality of malignant tumors of the nasopharynx is radiation therapy owing to its inaccessibility to surgical intervention. Over the last two decades there were many changes in techniques of delivery, which include the use of higher doses of radiotherapy, the use of wide radiation field, including the elective radiation of the whole neck, the combined use of brachy- and teletherapy, and the use of split-course therapy. In spite of these advances local and regional recurrences remain the major cause of death. As a boost therapy after external irradiation, high-dose-rate intracavitary irradiation using remote control afterloading system (RALS) was used in two patients. Our results were satisfactory, however, this procedure should only be performed by those who have developed enough expertise in the use of intracavitary techniques for the treatment of nasopharyngeal cancer and have a supportive team including a physicist, dosimetrist, nurse, and trained technologist.

The Dosimetry of Radiosurgery using of Rando Phantom.: Sung Kyu Kim, Sei One Shin, Myung Se Kim; Yeungnam Univ J Med. 1990;7(1):113-119. Published online June 30, 1990; DOI: https://doi.org/10.12701/yujm.1990.7.1.113

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Abstract PDF: The stereotactic radiosurgery using ionizing radiation of high energy is a technique for exadicating intracranial small tumors, which are inaccessible or unsuitable for open surgical technique. For such a small field radiosurgery, TLD or film dosimetry is essential. The three dimensional dose planning of radiosurgery was performed with dose planning computer system (Therac 2300). The target dose distribution and its error according to patient position were discussed. And were measured of circular cone which specially designed in our Hospital. The position error of Rando Phantom compared with CT were 0.4 mm in the AP-LAT section and in the AP-VERT section, 1.0 mm in the AP-VERT 45°section. The ratio of accuracy of the gantry and couch rotation were 1.5 mm diameter for central axis of 18MeV linear accelerator. Our study suggested that radiosurgery of small field in out department will be appropriate for clinical application.

Radiation Effect on Airway Obstruction from Lung Cancer.: Sei One Shin, Sung Kyu Kim, Myung Se Kim; Yeungnam Univ J Med. 1989;6(2):121-125. Published online December 31, 1989; DOI: https://doi.org/10.12701/yujm.1989.6.2.121

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Abstract PDF: Total 21 patients with airway obstruction from lung cancer treated with radiotherapy at Department of Therapeuctic Radiology, Yeungnam University College of Medicine, between April 1986 and December 1988 are retrospectively analyzed by means of roentgenologic findings. Obtained results are as follows. 1. 15 out of 21 patients (71%) showed complete or partial response. 2. Patients with small cell lung cancer showed 100% response in spite of low dose (30 GY/10 fractions.) 3. Patients with non-small cell lung cancer treated with 50 GY or over showed better response than below 45 GY or below. 4. There is no relationship between the response and site of airway obstruction. These date suggested that high dose irradiation is more effective in the management of airway obstruction from lung cancer and meticulous radiotherapy planning with appropriate protection of normal lung and critical organs should be investigated in order to maximize radiation effect and minimize side effect, complication or sequelae.

A Study on the Dose Distribution for Total Body Irradiation using Co-60 Teletherapy Unit.: Sung Kyu Kim, Sei One Shin, Myung Se Kim; Yeungnam Univ J Med. 1989;6(2):113-119. Published online December 31, 1989; DOI: https://doi.org/10.12701/yujm.1989.6.2.113

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Abstract PDF: In recent years there has been a growing interest in total body, hemibody, total lymphoid irradiation. For refractory leukemia or lymphoma patients, various techniques and dose regimens were introduced, including high dose total body irradiation for destruction of leukemic or bone marrow cells and immunosuppression prior to bone marrow transplantation, and low dose total body irradiation for treatment of lymphocytic leukemias or lymphomas. Accurate provision for specified dose and the desired homogeneity are essential before clinical total body irradiation. Purposes of this paper are to discuss calibrating Cobalt Unit in 3m distance using Rando Phantom, to compare calculated dose, calibrated dose, and compensating filters for homogeneous dose distribution in the head and neck, the lung and the pelvis. Results were following. 1. Measured dose on the lung was 6% higher than on the abdomen. Measured dose on the head (10%) and neck (18%) were higher than the abdomen because of thinness. Pelvic dose was measured 12% less than the abdomen. Those date suggest that compensating filter was essential. 2. Measured dose according to distance was 3% less than calculated dose which suggest that all doses in clinical use should be compared with calculated dose for minimizing error.

Histopathologic Change of External Abdominal Irradiation on Urinary Bladder of Mice at Total Dose and Intervals.: Kyoung Ae Kim, Myung Se Kim; Yeungnam Univ J Med. 1989;6(2):103-111. Published online December 31, 1989; DOI: https://doi.org/10.12701/yujm.1989.6.2.103

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Abstract PDF: The object of this study was to determine the radiation effect on the urinary bladder and to establish the basic date for optimal fraction schedule on the whole abdominal irradiation of the mice. Although radiation damage of the urinary bladder is one of the dose-limiting factor for treatment of lower abdominal cancer, such as uterine cervical or rectal cancer, systematic histopathological study of total dose and recovery duration is very rare, especially in conventional fractionation regimen of clinical use. Authors used 198 mice and analyzed histopathological findings according to total dose (40&50 GY) and recovery duration (1-15 weeks after completion of irradiation) The results were summarized as follows: 1. No definite difference of radiosensitivity was noted between male and female group. 2. Most of mucosal injuries were recovered within 14 weeks in 40 GY irradiated group. 3. Vascular injury and change of connective tissue were prominent and persisted even mild degree until 15 weeks after completion of irradiation in 50 GY irradiated group. 4. Although follow up duration of this study (105 days) was not enough to compare life span of mice, this study emphasized that precious schedule for treatment planning was necessary for preventing or reducing of late complication.

Clinical Evaluation of Dose Distribution in High Dose Rate Intracavitary Irradiation in the Treatment of Cervical Cancer.: Sei One Shin, Myung Se Kim; Yeungnam Univ J Med. 1989;6(1):87-98. Published online June 30, 1989; DOI: https://doi.org/10.12701/yujm.1989.6.1.87

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Abstract PDF: Clinical estimation of bladder and rectal doses from high dose rate intracavitary irradiation in carcinoma of the cervix uteri has been initiated on a routine basis in an effort to obtain the optimum radiotherapeutic dose. Simulation films with contrast media are used to image the bladder and rectum, and dose rates are estimated at various interesting points with the aid of treatment planning computer, NEC Therac-2300. Fifty-three patients have been reviewed in order to ascertain the correlation between radiation dose at interesting points in the bladder and rectum and the dose at Point A and B. The dose ratio between doses at Point A and interesting points in an important clinical factor in evaluating the treatment planning. This also serves as documentation of the dose to normal structures within the treatment volume. Authors conclude that obtained data are within acceptable ranges and routine simulation films of the bladder and rectum after administration of contrast media with dose calculations at interesting points provide important information for optimizing radiotherapy planning in the treatment of cervical carcinoma without increased time and effort or patient's discomfort.

A Study on ARC Therapy of 18MeV Linear Accelerator.: Seong Kyu Kim, Sei One Shin, Myung Se Kim; Yeungnam Univ J Med. 1988;5(2):31-36. Published online December 31, 1988; DOI: https://doi.org/10.12701/yujm.1988.5.2.31

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Abstract PDF: In recent years there has been a growing interest in all forms of rotational therapy, and many different types of therapy machines designed for this kind of treatment have become available. To the medical radiation physicist, the dosimetry of rotation therapy has presented a number of interesting problems, and much useful work has been published on the basic date of dose distribution and dosage calculation. The setting dose for ARC therapy were obtained by computer calculation and measurement with cylindrical phantom. Authors compared computer calculation with measured value. And in ARC therapy, the region of maximum dose in shifted from the tumor center. The extent of shift was analyzed by isodose distribution for ARC therapy techniques.

Intraoperative Radiation Therapy of locally Advanced Gastric Cancers: Case report.: Kyeung Ae Kim, Seong Kyu Kim, Sei One Shin, Myung Se Kim, Hong Jin Kim, Koing Bo Kwun, Hung Dae Kim; Yeungnam Univ J Med. 1988;5(1):153-158. Published online June 30, 1988; DOI: https://doi.org/10.12701/yujm.1988.5.1.153

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Abstract PDF: Stomach cancer is the most popular tumor in Korea but the prognosis following extensive surgery and chemotherapy has not improved for many years. Conventional external radiotherapy also has some limitation, namely, a cancerocidal dose cannot be delivered to tumors because of low radiation tolerance of adjacent critical sensitive organs. In order to overcome these limitations of curative surgery and external radiotherapy, intraoperative radiotherapy was proposed in many centers and the results were excellent. We treated two cases of locally advanced gastric cancers with IORT by using NEC 18 MeV Linear Accelerator after standard subtotal resection of the stomach. After treatment, the patients are in good conditions so far, but in order to evaluate the effectiveness of IORT, a study will be performed on the survival rates between patients treated by IORT and those treated by surgery alone.

One Case of Esophageal Cancer Treated with High Dose Rate ICR.: Kyeung Ae Kim, Sung Kyu Kim, Sei One Shin, Myung Se Kim; Yeungnam Univ J Med. 1988;5(1):147-151. Published online June 30, 1988; DOI: https://doi.org/10.12701/yujm.1988.5.1.147

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Abstract PDF: Esophageal cancers are highly malignant neoplasms. Prognosis of esophageal cancer treated by external irradiation alone is rather poor because of local recurrence and distant metastasis. Recently intracavitary irradiation has been used as a boost therapy after external irradiation to obtain better local control. One case of esophageal cancer has been treated by high dose rate remote-controlled after loading unit as boost therapy after external irradiation. The result was excellent in short term follow up esophagogram but esophageal bleeding and esophagotracheal fistula were noted in further follow up examination after inappropriate posttreatment management including insufficient chemotherapy due to poor general condition. We reviewed possible causes of esophageal bleeding and esophagotracheal fistula after external irradiation and high dose rate ICR.

Effects of same TDF Factors on Body Weight of Mice and Peripheral Blood Picture.: Sei One Shin, Seong Gyu Kim, Myung Se Kim; Yeungnam Univ J Med. 1987;4(2):89-96. Published online December 31, 1987; DOI: https://doi.org/10.12701/yujm.1987.4.2.89

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Abstract PDF: Using same TDE factors, the authors studied the effects of whole abdominal irradiation on body weight and peripheral blood picture in 30±3 day old mice. Fractions of 100 and 200 cGy were given five times a week to the final TDF factors 17, 33, and 49. Total 80 mice were irradiated with orthovoltage x-ray machine. Our results can be summarized as follows: There were no significant differences by sex. Body weight was progressively decreased by the duration for irradiation, but no remarkable difference by fractional dose. Hemoglobin level showed no remarkable change by fractional dose or TDF factors. Leukopenic changes showed that severity of decrease seems to be more related to TDF factors. There were no significant changes of differential count by TDF factors of total doses.

A Study on Equivalent Square Field in High Energy Photon Beam.: Seong Gyu Kim, Sei One Shin, Myung Se Kim; Yeungnam Univ J Med. 1987;4(2):83-88. Published online December 31, 1987; DOI: https://doi.org/10.12701/yujm.1987.4.2.83

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Abstract PDF: An analytic expression for equivalent square fields and a table are derived using the empirical representations obtained from the measured field size dependence of output for square field in a phantom. The expression is applicable to radiation fields that consistent with the following two assumptions imposed on these representations. 1) It is a linear function of the logarithm of the field area. 2) It is approximately the same function for both square and circular field of similar areas. In this paper, the derived tables and BJR table were consulted.

Radiation Effect on Body Weight and Peripheral Blood Picture Induced by Whole-Abdominal X-ray Irradiation with Different Fractionation in Mice.: Sung Heon Lee, Sei One Shin, Myung Se Kim; Yeungnam Univ J Med. 1987;4(1):25-32. Published online August 31, 1987; DOI: https://doi.org/10.12701/yujm.1987.4.1.25

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Abstract PDF: The object of this study was to determine the difference of radiation effect in different fractional does and to establish optimal fractionation schedule on the whole-abdominal X-ray irradiation. Total 160 mice were irradiated with 150 KVP, 15 mA orthovoltage x-ray machine and two different fractionation (100 cGy/Fr. and 200 cGy/Fr.) were used. Body weight, hemoglobin and WBC count with differential count were analyzed according to the same amount of total dose, same field size and two different fractionation schedules. The results of this study were summarized s follows: There was no significant difference in body weight and hemoglobin concentration by sex or fractional dose. Leukopenic change was prominent in the 3,000 cGy irradiation group and the proportion of decrease was remarkable in the 200 cGy/Fr. Group than 100 cGy/Fr. Group. Progressive decrease of lymphocyte count and reciprocal increase of neutrophil count were noted as dose increment. The effect of the fractional does on WBC count and proportion of lymphocyte were significant. This suggests that judicious selection of fractional dose may be important in clinical radiotherapeutic practice.

Total Dose Effect on Normal Skin of Hybrid Mice by Conventional Fractionated Irradiation.: Kyung Hee Jung, Myung Se Kim, Won Hee Choi; Yeungnam Univ J Med. 1986;3(1):261-267. Published online December 31, 1986; DOI: https://doi.org/10.12701/yujm.1986.3.1.261

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Abstract PDF: Development of supervoltage treatment machine may minimize skin reaction by skin-sparing effect, but skin damage is still one of “the dose limiting factor” in radiation therapy. In spite of these importance, systemic histopathologic studies of skin in similar conditions which used in clinical treatment has not been performed so far. 60 mice were irradiated with conventional fraction (200x5/wk) and whole abdominal field (2x3 cm, from symphysis pubis to xyphoid process). Used machine was 250 KV, 24 mA. orthovoltage x-ray machine. Histopathological changes of acute skin reaction at the level of total irradiation dose were analyzed and possible mechanism of later chronic changes were investigated. Obtained results are as follows 1. In 1,000 rad irradiated group, only mild epidermal edema is noted. 2. In 2,000 rad irradiated group, slightly decreased number and size of hair follicles and appendages, dermal edema and scanty infiltration of inflammatory cells are visible. 3. In 3,000 rad irradiated group, marked increased capillary congestion and prominent infiltration of inflammatory cells are observed. 4. In 4,000 rad irradiated group, vascular wall thickening with proliferation of endothelial cells are prominent. Dermal thinning and hyalinization are newly developed. 5. In 5,000 rad irradiated group, complete desquamation of epidermis is not seen, despite of acceleration of all above mentioned changes.

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